Develop Reference

Public Storage Folder API 30 Android 11

Android 11,
I'm trying to create a publicly accessible folder I can store my media files within, which will contain 1 folder and 1 text file per game type (there could be many), I do not want any other application to have access to the root folder for the exception of file explorers, as the user 'could' have content inside the folder that is R18 restricted or might not, I'm not in control of what content goes in there, it would be nice if I could provide that so that a child doesn't in mistakenly bump into the content while looking for pictures on the device for barnie.
I found some code on GitHub that did just the above on Android 10 and works flawlessly for Android 10, but cannot find anything but blue pills about it when it comes to Android 11, help in the form of example code would be great, yes I know targeting only Android 11 limits me but I'd rather live with the limit than play with many different versions of code.
val intent = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE).apply {
flags = Intent.FLAG_GRANT_READ_URI_PERMISSION or
Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION
}
startActivityForResult(intent, OPEN_FOLDER_REQUEST_CODE)
EDIT 2
After some hacking around, because 'startActivityForResult(Intent!, Int): Unit' is deprecated. Deprecated in Java, I end up with this, results is a URI, can I now use this to pass files to other API calls now?
pref = getSharedPreferences("myPref", Context.MODE_PRIVATE)
var userFolderData: String? = pref.getString("userFolderData", "")
if (userFolderData=="") {
val getUserFolderData =
registerForActivityResult(ActivityResultContracts.OpenDocumentTree()) {
mytools.debug(it.toString())
pref.edit().putString("userFolderData",it.toString()).apply()
userFolderData = it.toString()
}
getUserFolderData.launch("".toUri())
}
mytools.debug("userFolderData = ${userFolderData}")
EDIT 3
So I ran a test on the URI returned; always the same story not matter what I do, yes that's pretty ugly hack but it's the easiest way I can find to test it.
ivtitleimage.setImageURI("content://com.android.externalstorage.documents/document/primary%3ATest%2FMelsDeck%2Fbendover01.jpg".toUri())
31833-31833/com.example.cardgamexxx E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.cardgamexxx, PID: 31833
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.cardgamexxx/com.example.cardgamexxx.MainActivity}: java.lang.SecurityException: Permission Denial: opening provider com.android.externalstorage.ExternalStorageProvider from ProcessRecord{5a390cf 31833:com.example.cardgamexxx/u0a741} (pid=31833, uid=10741) requires that you obtain access using ACTION_OPEN_DOCUMENT or related APIs
EDIT 4
Right, so user selects folder/creates one with registerForActivityResult code above, I place files in it with Cx File Explorer and automagically drum roll! ...
I do not have read access to the file placed there, anyway thought I'd comment here as I don't want people stumbling on the post and thinking this works, because it doesn't.

On an Android 11 device your app can only create folders on root of external storage in the classic way if it has requested 'all files acces'.
Or it can use Storage Access Framework and for instance ACTION_OPEN_DOCUMENT_TREE to let the user create a folder in root of external storage and then select it.

mediaPlayer.setSpu() not working

Currently I am working on some code based on VLCJ to play video content, which is working pretty fine, but I am struggling hard making the setSpu() method work.
Just to mention, when it comes to load an external subtitle, in a file apart from the video file, it is working fine. The problem appears when I try to play subtitles contained in the media file. (e.g. subs contained into a MKV file).
I read carefully GitHub post "setSpu not working #278", and I think that maybe the problem is that I am not invoking the setSpu() method correctly.
To make it simple, I am trying to make it works on the example "uk.co.caprica.vlcj.test.basic.TestPlayer".
On TestPlayer.java class, I loaded all native vlc required libs and configured the mediaPath, and mediaPlayer, so if I execute the class, the media player is built properly, and the video starts playing.
Now, to try make the subtitle work, I reused the button "subTitlesButton" on "PlayerControlsPanel.java". First of all, as the spu to be set is the ID of the TrackDescription, I added the following code, and executed to get the spuDescriptions list:
subTitlesButton.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
System.out.println(mediaPlayer.getSpuDescriptions());
}
});
When the Sub-titles button is pressed, the following output is get:
spuDescriptions=[TrackDescription[id=-1,description=Deshabilitar], TrackDescription[id=3,description=Pista 1 - [Español]], TrackDescription[id=4,description=Pista 2 - [Inglés]], TrackDescription[id=5,description=Pista 3 - [Español]]]
So, to keep it simple, I just tried to add the following code and execute it:
subTitlesButton.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
System.out.println(mediaPlayer.getSpuDescriptions());
mediaPlayer.setSpu(3); // TrackDescription[id=3,description=Track 1 - [Spanish]]
}
});
The expected resault would be the subtitle "Track 1 - [Spanish]" with ID=3 to appear on screen, but nothing happens. The video goes on and is being played properly, but the sub-title is not shown.
All the other buttons, work fine when you pressed them, you get the expected result (pause, stop, play, fastforward, rewind, and so on)... so I dont get the point on why media.setSpu() is not working there.
Would be much appreciated some help :)
Thanks in advance.
EDITED The exact problem was that all subtitles contained in the media file (video.mkv) were UTF8 text encoded. I tried to re-mount the video.mkv file with mkvmerge, but this program allways converts SRT files to UTF8 text format.
WORKAROUND convert the SRT files to ASS subtitles format. If the video.mkv contains .ASS subtitles format, the subtitles are always loaded properly by VLC and also by vlcj libs.
Thanks a lot in advance for all the help provided.

If this question can be distilled down to how to use external SPU files with non-ASCII characters, you can try this:
Suppose you have some filename for your external SPU file, the filename containing non-ASCII characters, let's call this spuFileName...
Try:
String asciiFileName = new File(spuFileName)
.toURI()
.toASCIIString();
Or:
String asciiFileName = new File(spuFileName)
.toURI()
.toASCIIString()
.replaceFirst("file:/", "file:///");
Then use asciiFileName instead when you specify the SPU file for vlcj.
If I remember correctly, LibVLC requires ASCII strings on its API. This problem can also show itself if you try and play a video with a filename that contains non-ASCII characters (vlcj detects this and handles it automatically).
But I'm not sure if this really is your problem as given the partial log you posted it looks like VLC has indeed detected the SPU tracks correctly.
On the other hand, if this suggestion does actually work, vlcj could be changed to handle this case (an external SPU file) automatically.
When actually selecting SPU for display, whether the SPU are in a separate file or contained within the video itself, the only thing that matters is the id of the SPU track. vlcj passes this id directly to the LibVLC API method. The fact that the track description strings are not being encoded directly does not matter.
In earlier versions of VLC, this id was actually the index of the SPU track - so 0, 1, 2, 3 and so on.
With the current version of VLC (this was changed around February 2013, I think this means VLC 2.1+) this was fixed to use the actual SPU track identifiers.
So depending on your version of VLC, if the track identifiers are not working for you try just passing an index instead.

Can't play audio in android using MediaPalyer

I have file location in 05-11 22:43:41.793: D/Play audio(9996): /storage/emulated/0/QRSpeech/sounds/Introduction_to_Android_1.3gpp
I want to play this file using MediaPlayer like the code below :
mediaPlayer.setDataSource(tempDestFile);
mediaPlayer.prepare();
mediaPlayer.start();
where the tempDestFile is file path as printed above.
No sound is heard ? why ?

i've had this problem as well and tried several things. Try experimenting with MediaPlayer.create(Uri uri). Get your media's path and, if it's a string, convert it to Uri.
Another reason it could not be working is a context issue. Can you post the full code where you're using the MediaPlayer?

Playing media files using JAVA

I want to build a tread safe JAVA application which:
Play *.mp4 or other format HD media files (full-screen mode 1920x1080)
Add event bindings to applet (I'll be using touchscreen monitor)
I tried to search a lot, but found only outdated examples of JMF (VLCJ and etc.).
So I want you to ask from where to start building this applet.
What libraries I can include.
I found a similar project here: Media Shuffle
But I want my media files to be located in one folder and they appear in applications as icons which start selected video (VLC fullscreen or other cross-platform media player) to play on 1st touch. The second touch have to stop player and go to the main page.
Please, share your ideas how I can do that. Any code examples would be great.

I would recommend vlcj because i am sure it has all the formats you could need or have.Its not outdated at all and easy to start with.If you want to display a video graphically i dont think you could ever find so simple instructions like you mention but if you organize all steps that i will mention and explain in more depth you will see that vlcj is the best option for handling media like that (as it goes in my opinion).I also like and recommend JavaFx because of the effects you can make with that but its too difficult for me to setup and code in that stuff.
So, lets begin.Firstly, i would like to say that i have implemented the vlcj in a Swing-based application (in Windows) but that should not make you sad because for an immediate popup player that you mention we could just make a jdialog and place the video-surface in its contentPane.
Steps
1)So the first thing that should be done is to download vlc media player (we will need the 32 bit version that plays in both 32bit or 64bit computer environments).I had a terrible month trying to configure why my app wasnt loading the required libraries succesfully and found out that when you run a jar exetutable file it runs on 32-bit jvm(in eclipse was running in 64bit jvm and everything was ok.Thats why we need 32bit version), while i had 64-bit native libraries to load from.Anyways if you download and install 32bit vlc media player make somewhere a folder to include your project(lets say "C:/MyProject") inside MyProject create another folder and call it for instance "Needed"(here we will place all the required libraries for vlcj in order to work properly).Now from the contents of C:\Program Files (x86)\VideoLAN\VLC copy the plugins directory and the 4 dlls
(axvlc.dll,libvlc.dll,libvlccore.dll,npvlc.dll) and paste them inside your Needed folder
2)Now if you work in Eclipse IDE or similar you will need to make a folder in your project (lets say "lib") and inside that create another folder( name it "jars" ).In jars folder place the following jars: jna-3.5.1.jar, platform-3.5.1.jar,vlcj-2.2.0.jar.You can find these jars from vlcj google project.And then just include them to your classpath(either select them and right-click->add to build path or go to project properties->Java build path and add those 3 jars).Thats all for setup before we begin any coding with player setup.
3) You have to load now vlcj before starting using it.I just use this code to make that possible(i will explain it shortly dont worry).
public void LoadLibrary(){
SwingWorker loadWorker;
loadWorker = new SwingWorker(){
#Override
protected Object doInBackground() throws Exception {
// TODO Auto-generated method stub
Thread.sleep(2000);
path = new File("").getAbsolutePath().toString();
path = path.replace(".", "");
path = path.replace("\\", "//");
path = path+"//Needed";
if(RuntimeUtil.isWindows()){
NativeLibrary.addSearchPath(
"libvlc",path
);
Native.loadLibrary(RuntimeUtil.getLibVlcLibraryName(), LibVlc.class);
}
else if(RuntimeUtil.isNix()){
NativeLibrary.addSearchPath(
"libvlc",path
);
}
mediaPlayerFactory = new MediaPlayerFactory();
player = mediaPlayerFactory.newEmbeddedMediaPlayer();
CanvasVideoSurface videoSurface = mediaPlayerFactory.newVideoSurface(canvas);
player.setVideoSurface(videoSurface);
return null;
}
};
loadWorker.execute();
}
So what i do is to make a thread for Swing-based apps because you cannot play media if your media canvas is not displayable and everything in the constructor is fully built when its code is done.That means that before making the player we should first create a delay(mine is 2 seconds) for our constructor to end his job and our JFrame(or jWindow or jDialog etc) to become displayable.Next i calculate my path dynamically taking the path of my runnable jar(attention: not from workspace inside Eclipse) and entering the Needed folder to implement the required native libraries.Inside the if statement i tell the system to look for the libvlc.dll in the specific path i calculated and then load it and thus make one step forward to play media files.Outside if-else statement i actually create my player and place the canvas for its VideoSurface(canvas is a Canvas java.awt Object I use WindowsCanvas because i work only in windows, you could find for linux or mac a similar canvas(dont worry about that!)) Outside the Swing-Worker field(the thread) i just telling the thread to be executed (important as a call-function instruction).
4)To play a file i just use a button somewhere in my app to call an action event each time it is pressed so that we do something inside it.I for example make a JFileChooser to choose a media file from.You can easily search for it but here is my code:
final JFileChooser chooser = new JFileChooser();
FileNameExtensionFilter filter0 = new FileNameExtensionFilter(".wav", "wav");
FileNameExtensionFilter filter1 = new FileNameExtensionFilter(".mp3","mp3");
FileNameExtensionFilter filter2 = new FileNameExtensionFilter(".mpg","mpg");
FileNameExtensionFilter filter3 = new FileNameExtensionFilter(".mp4","mp4");
FileNameExtensionFilter filter4 = new FileNameExtensionFilter(".avi","avi");
FileNameExtensionFilter filter5 = new FileNameExtensionFilter(".flv","flv");
FileNameExtensionFilter filter6 = new FileNameExtensionFilter(".wmv","wmv");
FileNameExtensionFilter filter7 = new FileNameExtensionFilter(".3gp", "3gp");
FileNameExtensionFilter filter8 = new FileNameExtensionFilter(".swf", "swf");
FileNameExtensionFilter filter9 = new FileNameExtensionFilter(".mkv", "mkv");
FileNameExtensionFilter filter10 = new FileNameExtensionFilter(".flac", "flac");
FileNameExtensionFilter filter11 = new FileNameExtensionFilter("Music & Videos","wav","mp3","mpg","mp4","avi","flv","wmv","3gp","swf","mkv","flac","VOB");
FileNameExtensionFilter filter12 = new FileNameExtensionFilter("Music","wav","mp3","flac");
FileNameExtensionFilter filter13 = new FileNameExtensionFilter(".VOB", "VOB");
FileNameExtensionFilter filter14 = new FileNameExtensionFilter("Videos","mpg","mp4","avi","flv","wmv","3gp","swf","mkv","VOB");
chooser.setFileFilter(filter14);
chooser.setFileFilter(filter2);
chooser.setFileFilter(filter3);
chooser.setFileFilter(filter4);
chooser.setFileFilter(filter5);
chooser.setFileFilter(filter6);
chooser.setFileFilter(filter13);
chooser.setFileFilter(filter7);
chooser.setFileFilter(filter8);
chooser.setFileFilter(filter9);
chooser.setFileFilter(filter12);
chooser.setFileFilter(filter0);
chooser.setFileFilter(filter1);
chooser.setFileFilter(filter10);
chooser.setFileFilter(filter11);
int returnVal = chooser.showOpenDialog(getParent());
if(returnVal == JFileChooser.APPROVE_OPTION) {
System.out.println("You chose to open this file: " +
chooser.getSelectedFile().getName());
File myfile1 = chooser.getSelectedFile();
myfilepath1 = chooser.getSelectedFile().getAbsolutePath();
}
player.startMedia("file:///"+myfilepath1);
player.pause();
Those file filters are some of the media file types that vlcj can play for u.What i do is opening a file dialog to choose a file from and if i choose a file i hold its path(usefull for saying vlcj where to look for it).
5)Now to play the file u just have to type the following code :
player.play();
Maybe inside another action event of another Button.
6) if you finish writing those all you have to do is to export your project to a runnable jar file into your MyProject folder first created and run it (attention by double-clicking it (not from console(else it will be runned with 64bit jvm and you dont want that cause you have 32 bit natives and vlcj dont accept those conflicts)))
In Conclusion,i have to say that these steps worked for me.I hope they will help you go further in your app developement.
Regards,
PeGiannOS

First you have to
// create a player to play the media specified in the URL
Player mediaPlayer = Manager.createRealizedPlayer( mediaURL );
Now
mediaPlayer.start(); // start playing the media clip
I hope it work!

VLCJ isn't outdated, it's actively developed and immensely flexible and powerful in what it can achieve. I'm using it in my application to display a number of video streams inside the application at once, as well as doing things such as text overlays simultaneously. It's sometimes tricky to do this, but definitely possible.
There are a number of basic (up-to-date) examples to get you started with VLCJ here.

Don't show file path when playing video using VLCJ

I'm using VLC and VLCJ to play video and audio files in my Java application, which works fine.
But there appears a text when playing the video; this text is the path of the played video.
I don't want it to appear when playing a video, so how do I disable this using Java?

Pass the option :no-video-title-show to disable media title on video. See http://wiki.videolan.org/VLC_command-line_help
Example using VLCJ 1.2.0:
String[] options = {
":sharpen-sigma=2.0",
":blur-factor=127",
":ipv4-timeout=3000",
":no-video-title-show",
":loop",
":file-caching="+getFileCaching(),
":sout-all",
":sout-keep"
};
gc.getMediaPlayer().setRepeat(true);
gc.getMediaPlayer().setPlaySubItems(true);
gc.getMediaPlayer().playMedia(media, options);
Update:
Recent libVLC 2.0.x changes to vout feature may cause no-video-title-show not to work on per-playitem configuration :no-video-title-show anymore and may need to be set as per-global configuration --no-video-title-show. Pass per-global configuration options in the VLCJ factory constructor MediaPlayerFactory(options) instead of mediaplayer's xxxMedia method.

libVLC 2.1 has new native API to do this - from libvlc_media_player.h:
LIBVLC_API
void libvlc_media_player_set_video_title_display( libvlc_media_player_t *p_mi, libvlc_position_t position, unsigned int timeout );
This is available in vlcj 2.4.1 - from MediaPlayer.java:
void setVideoTitleDisplay(libvlc_position_e position, int timeout);
This API should always be used in preference to using the unsupported "options" array.
Example:
mediaPlayer.setVideoTitleDisplay(libvlc_position_e.disable, 0);